Telephone set



0. A. SHANN TELEPHONE SET Oct. 31, 1944-.

Filed Oct. 20, 1942 2 Sheets-Sheet 1 FIG. 2

lNI/ENTOR 0. A. SHA/V/V By Oct. 31, 1944. A H N 2,361,880

- TELEPHOINE SET Filed Oct. 20; 1942 2 Sheets-Sheet 2 /NVEN TOR O. A. SHANN A T TOPIVEI Patented Oct. 31, 1944 Bell Telephone Laboratories,

Incorporated,

New York, N; Y-', a corporation'ot New York. Application October '20, 1942;. Serial No. 462,712

11 Claims.

ties for this purpose consisted of a plunger and mechanism in the cradle for a handset whereby when the handset is" removed from the cradle the manualliftingo'f the plungercontrols a spring contact arrangement to cut oif or cut in an amplifying device in the telephone circuit and whereby the rotation of this plunger to difie'rent positions controls the spring contact arrangement for differentcontact' closing and opening positions to adjust to corresponding degrees a volume control device to control the effect of the amplifier device in the receiving circuit. plunger and a companion. plunger were also employed for controlling the usual line switching contacts for connecting the telephone set to the line when the handset was removed from the cradle.

It is a feature of the present invention to provide a control mechanism consisting of a plunger, independent of the regular line" switching contact operating plungers, which is operable when the handset is removed from the cradle and a disc in the side of the telephone set and mechanism controlled jointly by said plunger when actuated and said disc whenrotated for controlling amplifying and volume control devices in a manner'di'sclosed in the above-mentioned patent to Douglas H. King.

Another feature is an arrangement whereby when the handset is replaced in the cradle the restoring. of the plunger not only removes the amplifier from the telephone circuit but also restores the disc to normalrposition so that on a subsequent user of the amplifier the volume control may be regulated from a normal position as indicated by the normal position of the disc.

By this amplifier controlling arrangement the user of the set may include an amplifier in the telephone circuit and adjust its volume manually without danger of disturbing the line switching contact operations controlled by the ordinary plungers in the cradle and at the same time retaining the protective value of the simultaneous cut-off of theampli'fier and restoring. of the volume control means to normal when the handset is replaced on the cradle to open: the telephone circuit Furthermore, the ordinary plunger's' are available for the usual" manipulation of the line switching contacts for flashing the central onice without danger of interference with the setting of the. amplifier and volume. control means.

- e invention has been illustrated the accompanyingdrawings, in which:

Fig. 1 shows a perspective ot a telephone tand w in which the. applicants invention is incorporated;

Fig. 2shows someof the details inside the telephone stand: sufiicient to disclose. the applicants invention;-

Fig.- 3 shows airagmentary cross section across the telephone set approximately through the center of the cradle leaking from the front or the set; p I

Fig; 4 is a fragmentary righthand side view, partly iIliSGCfiOIl, of the portionof the telephone set shown in Fig. 3;, and

Fig. 5: is a circuit-diagram: of a telephone circuit including an amplifier, a volume control device and contact mechanisms for controlling these. devices. r

Referringv now to the drawings, and particular 1y to Figs; ii to 4;.the telephone setconsists oi the usual housing I with a dial; mechanism 2, a hand set i 3" shown lifted from a cradle: 4: in. which the usual switch operating. plungers 5 protrude and which control the usual switchingcontactstoes tablish connections: to a central otflce. In the center oi this cradle t is'also shownprotnuding. a plunger 6 whichrorms part of the applicants invention. i This housingglfl is mounted on abase plate h The usual plungers 5 normally are presseddown by the handset when replaced on the cradle to a, position where they operate on projections to on a lever ll pivoted on shaft l'zto hold this lever in a position so that the projection l3 thereon will maintain the usual switching contacts l4 in an open condition to have the telephone set. normally disconnected; from the telephone line; When the handset removed from the cradle, these plungers iarereleased and permit the lever l I to rotateso that projection l3 will ermit the contacts l4 toclose a connection between the subscriberfst telephone tension in the springs l 1 causes these operations totake place. This arrangemenatherefore. may

be constructed in accordance with the usual practice in telephone sets of this type.

A description will now be made of the mechanism in accordance with the applicants invention for controlling the amplifier and volume control devices which are usually located in the compartment formed by the base and shown in detail in the above-mentioned patent to Douglas H. King. This mechanism consists of the abovementioned plunger 6 which is seated for vertical movement in bearings at l and Hi. This plunger 9 is provided with a lateral projection l'l'which extends toward the right as shown in Fig. 3 and which is then bent downwardly and further towards the right as at I8 ending in the lateral extension I9. To this extension I9 is attached a button which is cone-shaped at the top and extends between a set of contacts 22 for control thereof when the plunger 5 is lifted by hand after the handset 3 is removed from the cradle 4. The button 20 is mounted to slide on a shaft 23 and to maintain steady the member l1 during its travel. The pin 24 is connected to the housing and projects through a hole in the member I! to further guide this member. The springs 22 are mounted at 25 on a projection 26 extending downwardly from the housing On this projection 26 is also mounted a bracket 28 which extends towards the right, looking at Fig. 3 (partially broken away) and ends in a right-angle projection 29 as shown in Figs. 3 and 4. To this projection 29 is also connected by means of screws 3| a bracket member 32 to lie parallel with and below projection 29. Between the projection 29 and the bracket member 32 is mounted a cam member 34 on the shaft 23. This shaft 23 is-journalled in the bracket 32 and projection 29 and extends downwardly below the bracket 32 Where it is attached to a disc 31 or other suitable operating member by means of a washer 38 and a cotter pin 39. The cam member 34 controls the group of springs 40 which are mounted on the bracket 28 at 4|. These springs are for the purpose of regulating a volume control mechanism for an amplifier when the disc 31 is rotated to different angu I 1 on the diaphragm of the amplifier 5|, back to the lar positions. The amplifier, on the other hand, may be cut into the telephone circuit when the handset 3 is removed from the cradle 4 by lifting the plunger 6 and button 20 which controls contacts 22 for this purpose. The disc 31 which, as shown in'Figs. 1 and 2, extends through an opening 44 in the housing I, may be rotated by hand from the outside of the set. The disc 31 and cam 34 are always returned to their usual normal positions when the button 6 is restored to normal either by hand or by the replacing of the handset by means of the following mechanism. It should be observed that below the extension l9 and on the shaft 23 is mounted a disc 42 having notches 43 each corresponding to a position to which disc 31 and cam 34 may be rotated to regulate the contacts 40. Engaging one of these notches is a roller 44 on a spring 45 mounted on the bracket 29 to yieldingly maintain the disc 42 in any angular position to which it has been moved. To the disc 42 is also connected at its under end a spiral spring 46 which has its outer end connected to the bracket 29. This spiral spring 46 is under tension so that when the roller 44 is lifted from a notch in disc 4| this disc will be rotated backto a normal position. This normal position is determined by a stop member 41 attached to the under-side of disc 4| and'which in'this position engages the stop pin48 attached to the bracket 29. To lift the roller 44 in this manner a cam extension 49 is projecting downwardly from the bracket extension l8 and this cam engages the spring 45 when the plunger 6 is in normal position to lift or shift the roller 44 away from the notch in which it rests in disc 42. When the plunger 6 is raised, the extension 49 leaves spring 45 to release the roller 44 to engage a-notch 43 in disc 42 with the cam 34 and disc 31 in normal position so that the disc 4 may now be rotated to any desired advanced position and held in this position by the roller 44 and spring 45 while the plunger 6 is raised.

With this mechanism the amplifier and volume control mechanisms may be controlled in a circuit as shown in Fig. 5, which is practically identical with the circuit disclosed in the above-mentioned patent to Douglas H. King. A short description of the operations will now be made.

If the handset 3 is removed from the cradle 4 the plungers 5 will be moved upwardly through the lever H by contact I4. The contacts |4 now establish a connection between the telephone line 50 and the subscribers telephone set. As the contacts 22 are normally arranged to have the amplifier 5| disconnected from the line, the transmitter circuit will extend from the tip conductor of line 50, contacts 52 of the switching contacts l4, windings 53 of the usual induction coil, the transmitter, contacts 54 of the dial 2, contacts 55 to the ring conductor. The receiver circuit will extend through the receiver contacts 56, contacts 51 and 58 of the contacts 22, contacts 59, winding 60, back to the receiver'and an inductive path through the coils 60 and El and condenser 62. If it is now desired to include the amplifier 5| in the receiver circuit, the subscriber would lift the plunger 6 to operate the contact springs 22 and if the disc 31 and cam 34 are in the position shown in Fig. 5 the amplifier 5| would amplify the talking current to the full capacity of the amplifier. A circuit for the receiver and amplifier would then be traced from the receiver, contacts 56, 51 and 64, battery 65, carbon button receiver and another circuit through the winding of the amplifier 5|, contacts 68 and 69 of springs 40, contacts 10, 58 and 59, winding 69, back through the winding of the amplifier 5|. Thus the speech current as induced in winding 60 from the line 50 would energize the coil of the amplifier 5| accordingly and affect the circuit through the receiver through the button and diaphragm of the amplifier 5| over the circuit described to amplify the sound output of the receiver accordingly. As none of the resistances 13 to 16 were included in the circuit for the coil of the amplifier 41 it would operate at full capacity.

If it is desired to have the amplifier included but with a medium amplification, the disc 3! is rotated at an angle of 45 degrees from the position shown in Fig. 5 to cause cam 34 to operate springs 40 into the position where this medium amplification would be effected. In this case the amplifier circuit will extend from the coil of the amplifier 5|, Winding 60, contacts 59, 58 and 10, resistances 15 and 16 in series, back through the coil of amplifier 5| with resistance 14 in parallel with resistance 15, through contacts 69 and I8 and resistance 14 in parallel with the coil of amplifier 5| and resistance 16 through contacts 19 and 80.. This would cause the coil of the amplifier 5| to be affected by speech current at a medium rate and consequently the receiver circuit aeai geao will be correspondingly affected to amplify the current at'the corresponding medium rate.

On the other-hand, if it is desired to have the amplifier included but with a lower application, the disc 31 and cam 34 may now be rotated another 45 degrees to operate the springs 40 to secure this effect. In this case the amplifier circuit will extend through the winding of the amplifier winding 60, contacts 59, 5B and 1.0-, resistances 1-5 and 16 in series, back through the winding of amplifier 5| and with the resistances 13- and 14 in parallel through contacts 69 and T8 and resistance 13 in parallel withthe winding of amplifier 5| and resistance 16.

Thus in this position the amplifier will be affected by speech cur-=- rents at a low rate-and the receiver circuits will be similarly affected. I

If the disc 31 and cam 34 are rotated another 45 degrees the amplification will be returned to the medium condition and another 45 degrees'will return it to the normal condition or high amplification.

The amplifier 5| may be included in the circuit to amplify the current for the receiver in these various manners as required by listeners and when the handset is returned on the cradle the plunger 6 willbe returned'to normal position to eliminate the amplifier 5i and to open the tele phone circuit to the line 50 through the plungers 5 and switching contacts l4. It shouldbe understood that the contacts 22 may be arranged differently so that normallythe amplifier would be included in the circuit without lifting the plunger 6' and the lifting of the plunger would cut out the" amplifier from the circuit to suit various sub scribers using the telephone set and without departing from the spirit of the invention.

Whatlis claimed is:

1. In combination, a telephone handset including, a receiver, a stand having a cradle member in which the handset normally rests, sound amplifying means for the receiver in. saidstand, a plunger accessible for operation when the hand: set is removed from the cradle, a rotatable disc in said stand extending partially through an opening in said stand to the outside thereof, and means inside said stand controlled jointly by said plunger if actuated and said disc if rotated for controllingsaid amplifying means to regulate the sound output of the receiver to various values.

2. In combination, a handset, a stand therefor having acradle in which thehandset normally rests, sound amplifying means in said stand, contacting and circuit means in said stand, a plunger means in said cradle accessible for operation when to the: longitudinal mm/ement thereof on. said shaft, a plunger'mechanism in said cradle lopera' live only after the handset is removed from the cradlefor moving said loose collar longitudinally on said shaft to control the associatedcontacts, andl adisc mounted on said shaft partially projecting through anaperture in said stand: to the outside thereof, said. disc being. associated with said cam so that when said disc1 is rotated the: cam. will rotate to the different corresponding. positions tov controlitheassociated setof contacts;

4;: Inecombination, :a telephone handset including: a receiver, a stand. therefor having a cradle in which the handset normally. rests, sound amplifying; means in said stand, a plunger in said stand: protruding on theoutside thereof in said cradle so that said plunger'can only be manipulated when the handset is removed from the cradle and so arranged that it will be restored to a normal position when the handset is replaced on the cradle, aset of contacts operative in response to the longitudinal movement of the plunger, means responsive to the actuation of'said contacts for'connecting said amplifying device'in u circuit with the receiver, a shaft in said stand,

a disc mounted on. said shaft for rotation and extending partially through an aperture in said stand to the outside thereof to enable said disc tobe manually rotated from the outside of the stand, a second set of contacts, a cam member on saidshaft and associated with said disc so as to be controlled by the rotary movement of said disc foractuating said second set of contactsin differentcombinations depending on theextentof the rotary movement of the disc, and means responsiveto theactuation of said second set ofcon tacts in said'different combinations for operating said amplifying device to amplifythe sound output of the receiver to different volumes corresponding to the different combinations of opera tionsof said secondset of'contacts.

5. In combination, a telephone handset including a receiver, a stand having a cradle member in which the handset normally rests, sound amplifyingmeans for the receiver in said stand, contacts andcircuit means in said stand for connecting said amplifying means to said receiver, contacts and circuit means in said stand for controlling the amplifyingmeans to regulate the sound output of the receiver, a disc in said stand par tially protruding through an opening in said stand I I to the outside thereof for the manual operation the handset is removed from the cradle through a manual movement of said plunger means for operating'said contacting and circuit means to associate said sound amplifying means or disconnecting it from said handset, and means including a disc in said stand protruding partially through an opening in said stand to the outside thereof, operative through a manual movement of the disc for operating said contacting and circuit means to regulate the effectiveness of said sound amplifying means.

3. In combination, a handset, a stand therefor having a cradle in which said handset normally rests, a mechanism in said stand comprising a shaft, a cam connected'thereto, a loose collar on said shaft, a set of contacts controlled by said cam in different combinations corresponding to different rotary movements of said shaft, a set of contacts controlled by said collar in response ofthe disc, a plunger mechanism in said stand accessible for operation when the handset is re"- moved from the cradle for actuating said firstmentioned contacts and circuit means to connect ordisconnect said amplifier means from there ceiver and for releasing said disc for manual rotary movement thereof, a cam member controlled by said disc for actuating said secondmentioned contacts and circuit means to control the amplifier means to regulate the sound output of the receiver in response to the rotary move;- ment of the disc if the sound amplifying means is connected to said receiver by said plunger mechanism.

6. In a. telephone system, a line, a handset including a transmitter and receiver, a stand having a cradle in which the handset normally rests, a telephone circuit including said receiver and transmitter, switching means in said stand for connecting said telephone circuit to the line, plungers in said cradle operatedby the removal of the handset from the cradle for actuating said switching means to connect said'telephone set to the line, sound amplifying means for the receiver in said stand, volume control means for said sound amplifying means in said stand, a special plunger in said cradle accessible for operation when the handset is removed from the cradle, a rotatable disc in said stand extending partially through an opening in said stand to the outside thereof, means inside said stand controlled jointlyby said special plunger if manually actuated after the handset has been removed from the cradle and by said disc if rotated manually from anormal position for cutting in the amplifying means in the telephone circuit forcthe .receiver and regulating the sound output of the receiver to various values and for cutting out the sound amplifying means from the receivercircult and restoring the disc to the normal position when said special plunger is restored by the replacing of the handset in the cradle.

7. In combination, a line, a telephone handset including a receiver, a stand having a cradle member in which the handset normally rests, a sound amplifying means for the receiver in said stand, circuit means in said stand including a set of contacts for connecting the handset to the line, a second set of contacts for connecting the sound amplifying means to the receiver, and a third set of contacts for controlling said sound amplifying means to regulate the sound output of the receiver to various values, a plunger mechanism operated when the handset is removed from the cradle for actuating said first set of contacts, another plunger mechanism operable manually after the handset has been removed from the cradle for actuating said second set of contacts and a disc in said stand operable manually for actuating said third set of contacts.

8. In combination, a line, a telephone set including a receiver, a stand having a cradle member in which the handset normally rests, a sound amplifying means for the receiver in said stand, including a set of contacts for connecting the handset to the line, a second set of contacts for connecting the sound amplifying means to the receiver and a third set of contacts for controlling said sound amplifying means to regulate the sound output of the receiver to various values, a plunger mechanism operated when the handset is removed from the cradle for'actuating said first set of contacts, another plunger mechanism operable manually from a normal position when the handset has been removed from the cradle for actuating said second set of contacts, a disc in said stand operable manually to various positions from a normal position for actuating said third set of contacts accordingly and a mechanism associable with said second plunger mechanism and said disc for restoring said disc to normal position on the restoring of said second plunger mechanism to normal in responseto the replacing of the handset in the cradle.

9. In combination, a line, a telephone handset including a receiver, a stand having a cradle member in which the handset normally rests, a sound amplifying means for the receiver in said stand, circuit means in said stand including a set of contacts for connecting the handset to the line, a second set of contacts for connecting the sound amplifying means to the receiver, and a third set of contacts for controlling said sound amplifying means to regulate the sound output of the receiver to various values, a plunger mechanism operated when the handset is removed from the cradle for actuating said first set of contacts, another plunger mechanism operable manually after the handset has been removed from the cradle for actuating said second set of contacts, a disc in said stand operable manually after said other plunger mechanism has operated for actuating said third set of contacts.

10. In combination, a line, a telephone handset including a receiver, a stand having a cradle member in which the handset normally rests, a sound amplifying means for the receiver in said stand, circuit means in said stand including a set of contacts for connecting the handset to the line, a second set of contacts for connecting the sound amplifying means to the receiver, and a third set of contacts for controlling said sound amplifying means to regulate the sound output of the receiver to various values, a plunger mechanism operated When the handset is removed from the cradle for actuating said first set of contacts, another plunger mechanism operable manually after the handset has been removed from the cradle for actuating said second set of contacts, a disc in said stand operable manually for actuating said third set of contacts, and means for restoring said disc to a non-operated position, operated in response to'the restoring of said other plunger mechanism when the handset is returned in the cradle.

11. In combination, a telephone handset including a receiver, a stand having a cradle member in which the handset normally rests, a sound amplifying means for the receiver in said stand, a plunger accessible for operation when the handset is removed from the cradle, an operating member in said stand which projects through an opening in said stand to the outside thereof and is accessible for operation at all times, and means inside said stand controlled jointly by said plunger if actuated and said operating member if operated for controlling said amplifying means to regulate the sound output of the receiver to various volumes.

- OSCAR A. SHANN. 

